$A$ species becomes prone to extinction due to

Some of the nutrient cycles are labelled as below

$I$.Sulphur cycle $II$.Phosphorus cycle

$III$. Carbon cycle $IV$ .Nitrogen cycle

Of these, the sedimentary cycle is represented by

Kaziranga is famous for

If we remove half of the forest cover of earth, the crisis that will occur

Assertion : In tropical rain forests. $O-$ horizon and $A-$ Horizon of soil profile are shallow and nutrient-poor.
Reason : Excessive growth of micro-organisms in the soil depletes its organic content